/Engine/Source/Runtime/Engine/Public/AudioDevice.h
Returns the azimuth angle of the sound relative to the sound's nearest listener. Used for 3d audio calculations.
void GetAzimuth ( const [FAttenuationListenerData](API\Runtime\Engine\FAttenuationListenerData) & OutListenerData, float & OutAzimuth, float & AbsoluteAzimuth ) const